A liiiitttle talk about top-tier matchups (for those tired of Pikachu talk, skip this post). I actually can't recall if I've done this before, but whatever, my opinions have probably shifted at least a little now with more experience, and I love talking about matchups:
This guy I went over earlier in my edgeguarding post, so I won't repeat all that. Pikachu's edgeguarding is very potent vs. him, whereas Diddy can't edgeguard him in return easily at all (f-air and predict where the up-b will go, I guess? You can actually die trying to recover after trying to edgeguard Pikachu though), and it's not necessarily in Diddy's favor onstage, where Pikachu has more mobility to deal with Diddy's mobility, QA is great for getting out of traps, and Pikachu's d-throw followups can be almost as damaging as Diddy's d-throw to up-air.
Very very even MU, maybe with a slight edge to Pikachu. Here's why. In most aspects, Pikachu and Sheik are pretty even. Needles and Tjolt are both annoying for the receiver; Vanish and Quick Attack are both good recovery options so they have a hard edgeguarding each other; Quick Attack and Bouncing Fish are good for mobility, and they both are fast on the ground; they both have trouble killing outside of a gimp or read (Pikachu really wishes that Sheik were easier to edgeguard, blah); they both stack damage very quickly. Pikachu has one important advantage though: he's small. Sheik's f-tilt and f-air often just pass over his head; I've actually had her
jab pass over my head after landing from a missed f-air. It's kind of ridiculous. Pikachu using d-tilt is so ridiculously safe from Sheik's approaches besides needles that I'm inclined to put this in Pikachu's favor, but I'll be conservative and say that it's even. It's certainly not in Sheik's favor, though.
Shaya covered this a long time ago. I don't necessarily agree that it's in Pikachu's favor, but the way he can weave in and out to deal with Luma makes him very potent in this MU, much like Sheik. Gravitational Pulling Tjolt is not very good btw, you just give Pikachu space to pressure you. Better off using a hitbox against it, in my experience. But your mileage may vary. Rosalina's huge hitbox has all kinds of advantages here, not the least of which is convenient edgeguarding with any kind of n-air between her and the ledge (though she can send Luma out ahead/mix up recovering on to the stage instead of to the ledge).
Ness is really hard onstage. His combos do more damage and he has a lot of range, surprisingly for someone with such stubby arms. But he's also very vulnerable offstage, as buffed as his recovery is (it's just that Pikachu is so good offstage). We saw this in ESAM vs. FOW where FOW beat ESAM in Winners using a superior onstage and PK Thunder juggling but ESAM came back and begin edgeguarding FOW extremely well in Losers Finals to take the set 3-0. It's even at the worst, but Pikachu's favor probably when both sides are playing optimally. Another conservative estimate.
Used to be Pikachu's hardest matchup in Brawl, imo, but with the nerf to Lucario's normals this isn't bad at all. Gimping Lucario is easier for Pikachu than it is for most characters (ground mobility + Thunder + b-air + tjolt), so you can often kill him before he gets into huge percents. Also, with Quick Attack, you can confirm a KO on a high-percent Lucario when he's playing uber defensively. I'm still going to call this even just because Lucario is really stupid sometimes at high percents.
In Pikachu's favor despite the sword, imo. Robin's Levin Sword is truly fearsome, but Pikachu can weave in and out of Elfire range with Quick Attack and general mobility, and Robin is actually kind of vulnerable to followups and getting grabbed since his own grab is kind of weak (my opinion of Robin gets worse over time when I consider that grab). Elwind is a very very edgeguardable recovery: catch Robin with even one tjolt or thunder and he can be done right there. I've gotten spiked by Robin and still managed to recover and edgeguard him back a few times. Quick Attack is serious business.
The ZSS boards were complaining about how bad this MU is for them earlier, if I recall. It is pretty bad for her, just because of the stature difference and pressure.
is probably in a similar boat, only I find it way easier to edgeguard Falcon than ZSS so he may have it worse. I love it when the jab goes over my head, though. That's hilarious.
Not free, even his recovery isn't free. He's a little harder than the Sheik matchup imo, because his profile is lower and he's harder to hit as a result; also, he has some disjoints on his up-smash and d-smash, which is troubling for Pikachu (his f-air does as well, that's another annoying move). If there's anyone in this group that I'd argue as having an advantage over Pikachu, it'd be this guy, but Hydro Pump is still very gimpable, and it's hard to gimp Pikachu's up-b back with it (trust me, I've tried). Still, objectively Greninja probably wins if he recovers safely.
All of Yoshi's matchups are even, I swear. >_> Pikachus should learn to edgeguard him with footstools, though, otherwise he kills way earlier.
, since apparently this guy is top tier according to some people. I will start talking about the Mario matchup when I talk about top-tier matchups from now on. Anyway, onstage it's surprisingly even, but offstage Pikachu wins, though it's not free (Mario's recovery range is just not great, that's all, leaving him open to a lot of stuff). I'd put this in Pikachu's favor. Tjolt > fireballs helps.
So this guy is pretty good. I don't think he has a bad matchup besides Greninja in the top 10-15 characters in the game.